Safety thread cutter



Oct. 24, 1950 ILV MAN 2,527,201

' SAFETY THREAD CUTTER Filed July 24, 1947 INVENTOR. Ann. C. SILVERMAN ATTORN EY Patented Oct. 24, 1950 UNITED, STATES PATENT OFFICE 2,527,201 v SAFETY THREAD CUTTER Anna C. Silverman, New York, NY. Application July 24, 194i, Serial No. 763,187

'3 Claims.

T This invention relates to a safety thread cutter for useabout sewing machines. a It is an object of the present invention to pro- .vide a thread cutter which is of simple construction and adapted to be placed on a standardin such a manner as to prevent the axial displacement of the blade from the guard element and its guard having a stop at one end to properly .locate the blade within the same and wherein the guard and blade can be mounted upon a sewing machine pressure foot.

-:It is another object of the present invention to providea safety thread cutter with a standard which is notched so that the guard can be inclined in either. a down direction from one side of the standard or in an up direction from the other side of the standard by fixing the attaching screw in a second hole on the standard.

It is another object of the present invention to provide in a safety thread cutter a guard which itself has a cutting edge thereon adapted to engage with one sideof the thread to bring,

when the guard is pivoted slightly, the thread upon the cutting blade and whereby to cut the same off at this side Of the thread with a shearing action.

Other objects of the present invention are to provide a thread cutter which is inexpensive to manufacture and efficient in operation.

According to the invention, the thread cutter includes a guard which is grooved to receive a blade and wherein there are on the guard inclined edges terminating in a notch into which the blade extends whereby as the thread is drawn-down over the inclined edges it will be drawn into the .notch and over the blade edge. In order to prevent displacement of the blade from the guard, the rear end of the guard is provided with an inwardly bent stop portion. This stop portion facilitates assembly of the guard on the standard. The guard may also be mounted upon a pressure foot by the use of an .angle member which is connected to the guard and also to the side of the pressure foot as by means of a screw. The standard may have opposed notches on opposite sides of the same so as to permit the tilting of the guard plate and the blade so as to render the "blade more accessible under some circumstances.

This adjustment may be effected when the blade and the guard are removed and the attaching screw secured to another hole between the notches on the standard. In another form of the invention thereis provided a cutting edge along the front of the guard and the guard is permitted to slide over .the blade whereby to cause a thread to "be cut from .opposite sidesof the same with a shearing action. The guard is .pivotally connected to .standard l5 having a base I the standard and only limited tilting and shearing movement are permitted. Such a shearing device is advantageous where threads are difiicult to cut over the blade or where the blade has become slightly dull and the severance of the thread is such that a shearing action is required.

For further comprehension, of the invention,

and of the objects and advantages thereof, reference will be had to the fOllOWil'lg description and accompanying drawing, and to the appended claims in which the various novel features of the invention are more particularly set forth.

V In the accompanying drawing forming a material part of this disclosure:

Fig. 1 is a perspective view of the thread cutter with the guard in place and assembled upon a standard.

Fig. 2 is a side elevational view of the thread cutter. I

Fig. 3 is an end elevational view'with portions broken away and shown in section, as viewed on the line 33 of Fig. 2.

Fig. 4; is a perspective view of the guard plat looking upon the interior face of the same.

Fig. 5 is a perspective view of the cutting blade.

Fig. 6 is a perspective view of the standard showing the cut away portion on one side.

Fig. 7 is a perspective view of a pressure foot .and of the guard and blade assembled upon an angle member which is in turn secured to the pressure foot.

Fig. 8 is a top plan view of Fig. 7.

Fig. 9 is a side elevational view of a standard having notches therein and two screw holes.

Fig. 10 is a side elevational view of the standard with the blade and guard tilted downwardl into thenotches of the standard.

Fig. 11 is a side elevational view of a modified form of the invention wherein the guard can be pivoted relative to the blade so that its cutting edge thereon will be drawn over the blade cutting edge to eifect shearing action upon a thread.

Fig. '12 is a side elevational view similar to Fig. 11 with the guard in its depressed position.

Fig. 13 is an expanded view of the cutter with the guard removed from the standard and the blade.

The thread cutter, according to the form of the invention illustrated in Figs. 1 to 6, inc'ludes a 6 withholes ll therein through which fastening screwsare extended to connect the standard to'a part of a sewingv machine. The upper part of the standard 1.5 is formed with .a recess or cutaway portion [8, see figs. 3 and 6, to provide a shoulder I9 thereon,

3 a hole 2| extends through the standard l5 at the recessed or cut away portion t8.

A guard 24 has a face 22, Fig. 4, for receiving a blade 23. The guard 24 has an inbent bottom lip 25, a top notch 26, an inclined edge 21 formed over a projection 28 which extends forwardly and upwardly. On the opposite side of the notch there is an inclined edge 29. The thread will be engaged between these inclined edges 21 and 29 and will be directed into the notch 26. The blade 23 has a cutting edge 3| thereon which will extend across the notch 26 and accordingly any thread extended over the inclined edgeswill be out upon reaching the notch. A hole 32 extends through the plate 24 for receiving an attaching screw 33 which will fix the plate and the blade 23 to the recessed or cut away portion H! of the standard upon the fastening screw entering the hole 2! thereof. In order that the guard plate 24 will be retained against pivotal movement, there is provided on the end adjacent the standard l5 and inbent portion 34. This inbent portion 34 will also prevent a rearward displacement of the blade 23. The blade to receive the fastening screw 33.

In Figs. '7 and 8, there is shown an angle piece 31 which is fastened by a screw 38 to a pressure foot 39. This pressure foot is a part of the sewing machine and through the angle 3?, there are connected by a screw 4| the guard 24 and the blade 23. It will thus be apparent that the blade and guard can be mounted in a different manner than upon the standard l5 and by the use of an angle member 31. With the cutter on the pressure foot it is readily accessible so that one may sever a thread which is being used with the sewing machine.

In Figs. 9 and 10, there is shown a modified form of standard. In this standard, there are provided reverse notches 43 and 44 which are arranged when the attaching screw is extended through a central hole 45 to permit the cutter to be tilted, as shown in Fig. 10. This adjustment may render the cutter more accessible to the operator. When it is desired to have the cutter located upon the standard in the usual straight or horizontal manner, the screw within the hole 45 is removed and the cutter is raised so that the screw can be engaged into an upper hole 41. The inbent portion 34 will provide a stop to rest against the upper notch 43 and the ends of the inbent bottom will enter the bottom notch 44.

In Figs. 11, 12 and 13, there is shown a modified form of the invention. A standard 5| is provided having a projection 52 on its upper end with a pivot hole 53 therein. A recess 54 is provided in one face of the standard to receive a blade 55 having a top cutting edge 56. The blade is secured by screws 51 to the standard and within the recess 54.

A guard 58 has a notch 6| across one side of which the blade 55 extends. The guard 58 has a cutting edge 52 which forms one side of the notch and which will cooperate with the cutting edge 56 to effect a shearing action of the edge 62 with the blade edge 56. The guard 58 is pivoted by a pin 83 extending through the pivot hole 53. On

23 is formed with a notch the rear of the guard 58 there is a depending portion 54 engaged by a spring stop 65 secured to the back of the standard 5|. A thread will be extended into the notch and limited downward otable movement is effected by depressing the guard 58, see Fig. 12, so as to draw the thread downwardly over the cutting edge 55 of the blade 55 to effect shearing action thereon. The spring 65 will return the guard to its normal position so that the device can be used without shearing action as the other cutters are used.

While I have illustrated and described the preferred embodiments of my invention, it is to be understood that I do not limit myself to the precise constructions herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention as defined in the appended claims.

Having thus described my invention, what I claim as new, and desire to secure by United States Letters Patent is:

1. A thread cutter comprising a standard, a cutting blade with a top cutting edge connected to the standard to extend laterally therefrom, a guard having a notch in the top edge pivotally connected to the standard, a stop on the standard engaging with the guard to limit its downward.

pivotal movement, whereby a thread can be eX- tended into the notch and brought down upon the cutting edge of the blade, said notch having a cutting edge extending along one side of the same whereby as the guard is tilted downwardly with the thread within the notch a shearing action is effected between the notch cutting edge and the top edge of the blade.

2. A thread cutter comprising a standard, a cutting blade with a top cutting edge connected to the standard to extend laterally therefrom, a guard having a notch in the top edge pivotally connected to the standard, a stop on the standard engaging with the guard to limit its downward pivotal movement, whereby a thread can be extended into the notch and brought down upon the cutting edge of the blade, said notch having a cutting edge extending along one side of the same whereby as the guard is tilted downwardly with the thread within the notch a shearing action is effected between the notch cutting edge and the top edge of the blade, and the opposite side of the notch having an inclined edge through which a thread can be extended and directed into the notch.

3. A thread cutter comprising a standard, a cutting blade with a top cutting edge connected to the standard to extend laterally therefrom, a guard having a notch in the top edge pivotally connected to the standard, a stop on the standard engaging with the guard to limit its downward pivotal movement, whereby a thread can be extended into the notch and brought down upon the cutting edge of the blade, said notch having a cutting edge extending along one side of the same whereby as the guard is tilted downwardly with the thread within the notch a shearing action is effected between the notch cutting edge and the top edge of the blade, and a spring mounted on said standard on the side opposite the side from which said cutting blade laterally extends and engaging said guard retaining the same in an upward pivoted position.

ANNA C. SILVERMAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 442,254 Hicks Dec. 9, 1890 1,066,957 Self July 8, 1913 1,349,627 Peterson Aug. 17, 1920 2,372 609 Silverman Mar. 27, 1945 2,471,334 Levin May 24, 1949 

